Is it normal i orgasm in my sleep?

I am a female, who is many years past puberty, and I orgasm in my sleep a few times year.
I have literally just woken up from an orgasm. The dream was vivid. I was having doggy style sex with a man in a library (?) until I reached orgasm.
But it's different everytime. Some times the dream isn't vivid at all and I can't remember what made me orgasm. Some times I will wake up mid orgasm and it is amazing! Or some times I will just carry on sleeping/dreaming. Some times I'll be having sex in a dream on the edge of orgasm and I'll be actually touching myself, which I just can't control.
So IIN? The only thing I can complain about is I wish it happened more often!